GARbro-mirror/Legacy/Sviu/ArcPKZ.cs

187 lines
6.5 KiB
C#

//! \file ArcPKZ.cs
//! \date 2018 Aug 26
//! \brief SVIU System resource archive.
//
// Copyright (C) 2018 by morkt
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.ComponentModel.Composition;
using System.IO;
using System.Linq;
using GameRes.Utility;
// [030725][Hayashigumi] Fall in Love
namespace GameRes.Formats.Sviu
{
[Serializable]
public class PkzScheme : ResourceScheme
{
public Dictionary<string, byte[]> KnownSchemes;
}
internal class PkzArchive : ArcFile
{
public readonly byte[] Key;
public PkzArchive (ArcView arc, ArchiveFormat impl, ICollection<Entry> dir, byte[] key)
: base (arc, impl, dir)
{
Key = key;
}
}
[Export(typeof(ArchiveFormat))]
public class PkzOpener : ArchiveFormat
{
public override string Tag { get { return "PKZ"; } }
public override string Description { get { return "SVIU System resource archive"; } }
public override uint Signature { get { return 0x305A4B50; } } // 'PKZ0'
public override bool IsHierarchic { get { return false; } }
public override bool CanWrite { get { return false; } }
PkzScheme DefaultScheme = new PkzScheme { KnownSchemes = new Dictionary<string, byte[]>() };
public override ResourceScheme Scheme
{
get { return DefaultScheme; }
set { DefaultScheme = (PkzScheme)value; }
}
public override ArcFile TryOpen (ArcView file)
{
int count = file.View.ReadInt32 (4);
if (!IsSaneCount (count))
return null;
var key = QueryKey();
if (null == key)
return null;
uint data_offset = (uint)count * 0x2Cu + 0x14u;
var index = file.View.ReadBytes (8, data_offset - 8);
DecryptData (index, key);
var dir = new List<Entry> (count);
int index_offset = 0xC;
for (int i = 0; i < count; ++i)
{
var name = Binary.GetCString (index, index_offset, 0x20);
var entry = FormatCatalog.Instance.Create<Entry> (name);
entry.Size = index.ToUInt32 (index_offset+0x20);
entry.Offset = index.ToUInt32 (index_offset+0x24) + data_offset;
if (!entry.CheckPlacement (file.MaxOffset))
return null;
dir.Add (entry);
index_offset += 0x2C;
}
return new PkzArchive (file, this, dir, key);
}
public override Stream OpenEntry (ArcFile arc, Entry entry)
{
var parc = (PkzArchive)arc;
var data = arc.File.View.ReadBytes (entry.Offset, entry.Size);
DecryptData (data, parc.Key);
if (data.AsciiEqual (0, "SVS18"))
data = UnpackScript (data);
return new BinMemoryStream (data, entry.Name);
}
byte[] UnpackScript (byte[] data)
{
if (data.ToInt32 (0x10) == 0)
return data;
int unpacked_size = data.ToInt32 (0xC);
int header_size = data.ToInt32 (0x14);
int packed_size = data.ToInt32 (0x1C);
var output = new byte[unpacked_size];
Buffer.BlockCopy (data, 0, output, 0, header_size);
LittleEndian.Pack (0, output, 0x10);
using (var input = new BinMemoryStream (data, header_size, packed_size))
LzUnpack (input, output, header_size);
return output;
}
void LzUnpack (IBinaryStream input, byte[] output, int dst)
{
var frame = new byte[0x800];
int frame_pos = 0x7E8;
int ctl = 1;
while (dst < output.Length)
{
if (1 == ctl)
{
ctl = input.ReadByte();
if (-1 == ctl)
break;
ctl |= 0x100;
}
if (0 != (ctl & 1))
{
byte b = input.ReadUInt8();
output[dst++] = b;
frame[frame_pos++ & 0x7FF] = b;
}
else
{
byte lo = input.ReadUInt8();
byte hi = input.ReadUInt8();
int offset = lo | (hi & 0xE0) << 3;
int count = (hi & 0x1F) + 2;
for (int i = 0; i < count; ++i)
{
byte b = frame[(offset + i) & 0x7FF];
output[dst++] = b;
frame[frame_pos++ & 0x7FF] = b;
}
}
ctl >>= 1;
}
}
public static byte[] CreateKey (string key)
{
var bkey = Encodings.cp932.GetBytes (key);
for (int i = 0; i < bkey.Length; ++i)
{
bkey[i] += 6;
}
return bkey;
}
void DecryptData (byte[] data, byte[] key)
{
for (int i = 0; i < data.Length; ++i)
{
data[i] ^= key[i % key.Length];
data[i] += 0x80;
}
}
byte[] QueryKey ()
{
if (DefaultScheme.KnownSchemes.Count == 0)
return null;
return DefaultScheme.KnownSchemes.Values.First();
}
}
}